Weather Alerts for California
1. Air Quality Alert for: Imperial County Southwest; Imperial County West; Imperial Valley
2. Freeze Watch for: Western Siskiyou County
3. High Wind Warning for: Lassen-Eastern Plumas-Eastern Sierra Counties
4. High Wind Warning for: Mojave Desert Slopes
5. High Wind Warning for: Mono
6. High Wind Watch for: Santa Susana Mountains
7. High Wind Watch for: Western Santa Monica Mountains Recreational Area; Western San Gabriel Mountains and Highway 14 Corridor
8. Wind Advisory for: Central Siskiyou County
9. Wind Advisory for: Coastal Del Norte; Del Norte Interior
10. Wind Advisory for: Indian Wells Valley; Mojave Desert
11. Wind Advisory for: Modoc County
12. Wind Advisory for: San Bernardino County Mountains; Riverside County Mountains; San Diego County Mountains; Apple and Lucerne Valleys; Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
13. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
14. Wind Advisory for: Santa Susana Mountains
15. Wind Advisory for: Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains
16. Wind Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor
17. Wind Advisory for: Surprise Valley California; Northern Washoe County
18. Wind Advisory for: Western Antelope Valley Foothills; Antelope Valley
19. Wind Advisory for: Western Mojave Desert
20. Winter Weather Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
21. Winter Weather Advisory for: Modoc County
22. Winter Weather Advisory for: Northern Trinity
23. Winter Weather Advisory for: West Slope Northern Sierra Nevada
24. Winter Weather Advisory for: Western Siskiyou County
25. Winter Weather Advisory for: Yosemite NP outside of the valley; Upper San Joaquin River
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North America Water Vapor (Moisture)
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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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